Add licence.

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+RISCV Sail Model
+
+The Sail architecture models here, comprising all files and
+directories are subject to the BSD two-clause licence
+below.
+
+Copyright (c) 2013-2018
+  Kathyrn Gray
+  Shaked Flur
+  Stephen Kell
+  Gabriel Kerneis
+  Robert Norton-Wright
+  Christopher Pulte
+  Peter Sewell
+  Alasdair Armstrong
+  Brian Campbell
+  Thomas Bauereiss
+  Anthony Fox
+  Jon French
+  Dominic Mulligan
+  Stephen Kell
+  Mark Wassell
+
+All rights reserved.
+
+This software was developed by the above within the Rigorous
+Engineering of Mainstream Systems (REMS) project, partly funded by
+EPSRC grant EP/K008528/1, at the Universities of Cambridge and
+Edinburgh.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in
+   the documentation and/or other materials provided with the
+   distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.